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selftests: bpf: add zero extend checks for ALU32 and/or/xor 

Add three tests to test_verifier/basic_instr that make sure that the
high 32-bits of the destination register is cleared after an ALU32
and/or/xor.

Signed-off-by: Björn Töpel <bjorn.topel@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Björn Töpel 2019-05-22 11:23:23 +02:00 committed by Daniel Borkmann
parent fe121ee531
commit 00d8304553
1 changed files with 39 additions and 0 deletions
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39
tools/testing/selftests/bpf/verifier/basic_instr.c
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@ -132,3 +132,42 @@
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
},
{
"and32 reg zero extend check",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, -1),
BPF_MOV64_IMM(BPF_REG_2, -2),
BPF_ALU32_REG(BPF_AND, BPF_REG_0, BPF_REG_2),
BPF_ALU64_IMM(BPF_RSH, BPF_REG_0, 32),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = 0,
},
{
"or32 reg zero extend check",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, -1),
BPF_MOV64_IMM(BPF_REG_2, -2),
BPF_ALU32_REG(BPF_OR, BPF_REG_0, BPF_REG_2),
BPF_ALU64_IMM(BPF_RSH, BPF_REG_0, 32),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = 0,
},
{
"xor32 reg zero extend check",
.insns = {
BPF_MOV64_IMM(BPF_REG_0, -1),
BPF_MOV64_IMM(BPF_REG_2, 0),
BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_2),
BPF_ALU64_IMM(BPF_RSH, BPF_REG_0, 32),
BPF_EXIT_INSN(),
},
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.result = ACCEPT,
.retval = 0,
},